Injection of water (pump and injectors)

Edits and changes to engines, experiences, findings and ideas.
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abyssin3
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by abyssin3 » 15/09/08, 17:52

NB: Since the injector at 0.75 GPH did not work, the only one that I really tried is the one at 2,5GPH delivering 75g / m3 of air ... i.e. saturated humidity (largely> 100%) at any temperature.
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by Christophe » 15/09/08, 18:24

abyssin3 wrote:A small correction on the% RH.


Totally agree! To make an accurate approximation, you would need an hour meter on the injector ...
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by abyssin3 » 15/09/08, 20:36

I had already checked the flow rate of the 2,5GPH injector. Continuously it was good 150ml / min, even if it was not exactly at mL ready. So I assume that the flow rate given for the injector is fair. Only, it does not say how long the system is running per hour, but that does not change anything at% RH at the time of injection.
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by Flytox » 15/08/09, 17:55

Hello abyssin3
abyssin3 wrote:Once mounted correctly, it pissed a very fine jet but at more than 2m. For a "haze", it is average. I preferred to mount my old injector (2.5GPH) which was really a mist.


For your sprinkler, there is a way to recover mist from the very fine jet. The jet must break on a perpendicular surface close to the nozzle, always in the direction of the air flow. You get a fine mist orthogonally over 360 °. :P
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by elephant » 15/08/09, 18:11

Strange subject where the penultimate intervention dates from September 15 of last year. Has this system worked?
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by Flytox » 16/08/09, 19:37

Hello elephant

It may sound strange but it is related to this post:

https://www.econologie.com/forums/injection- ... 80-80.html

The subject is still relevant 8)
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by Capt_Maloche » 16/08/09, 23:48

OH, but here are two topics that come together :D https://www.econologie.com/forums/injection- ... t8180.html

This is indeed the principle that I will apply in order to spray in the HP part of the air distributor (after the turbo therefore)

Ah and guys, I read you grope with the water flow rates, I confirm that the flow rates are around 10 to 30% in fuel volume, or 0.6 to 1L / h on average for recent vehicles

the idea is to regulate the injection according to the fuel flow

I test on a clio III 2008 1.5 DCI of 70Cv whose consumption ranges from 4L / 100 to 13L / 100 full flock (so to speak because it is not a bomb : Cheesy: ) it is necessary to take this last value in 5th at 100km / h in order to be able to report it in liters / hour

so I have to modulate the water flow from 0 to 13L depending on the fuel injection

2 solutions:
take the information from the injectors (easy according to AlainG) or from the information from the throttle valve

there I need the house electronics, Eleph and the others, are you there? :D

I continue on the other subject and I will follow this one
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by abyssin3 » 17/08/09, 00:26

but if you want a water injection, the simplest is still to buy a kit, I put links on your subject elsewhere. 90% of the price of the basic kit, it is the pump, inevitable

On the other hand the problem to make a flow proportional to the engine speed, it is that the injection works in all or nothing:
- either your pump is ON -> it does 100psi -> the check valve gives way and your injector injects.
- either the pump is off -> pressure 0psi -> the check valve does not give way and your injector does not inject.
This is why mine started only at 3000 rpm (either on the highway). It was the best way to have a relative humidity which was not too high (Cf. beginning of the subject)

Now they are making 2-stage turbo kits (more expensive). But I think it only relies on several different injectors. Ex: you have 4 injectors:
- 2 are engaged at low pressure.
- 2 others at high pressure (and also the 2 at low pressure already engaged). And in this case the volume injected increases.

But I doubt that it is linear: the pump is not modular :-(
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by Capt_Maloche » 17/08/09, 22:14

Bah bah bah! :D

it's complicated and far from what we are looking for, you need a permanent and proportional injection to be effective

I'm going to take a fuel pump with a twingo version 1 single-point injector

The advantage is that there is a pressure setting on the injector around 10 bars with a return circuit as on oil pumps

that solves the problem of flow 0 and facilitates proportional injection
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by Alain G » 17/08/09, 23:11

Capt_Maloche

If you can get a car injector with pump and regulator, it would be nice, by injecting on the outlet of the exhaust manifold outside of course and recovering the vapor to suck it in the butterfly, it could work, but it should be injected in a shorter time to limit the water, this would be possible with a capacitor in series with the injector and a resistor to discharge the capacitor or use a pulse length limiter.
:D
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